JSTL 自定义Function函数标签

来源:互联网 发布:2k17库里捏脸数据 编辑:程序博客网 时间:2024/05/16 12:07
1.首先编写类,注意:类里面的变量与方法必须是static的;

  如:

  Java代码  

public class TestFunction {   private static ProductInfoManager productInfoManager = (ProductInfoManager) Platform.getInstance().getBean("productInfoManager");   public static List getLastDataByType(int type, int lastSize) {  return productInfoManager.getLastDataByType(type, lastSize);  }   public static Boolean isLogin() {  Customer customer = (Customer) ServletActionContext.getRequest().getSession().getAttribute(SessionUser.Customer_Session_User_Key);  if (null == customer) {   return false;  }  return true; }


2.定义tld文件;

  如:

  Java代码

<?xml version="1.0" encoding="UTF-8" ?> <taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"  version="2.0">   <tlib-version>1.0</tlib-version>  <short-name>my</short-name>  <uri>http://www.myproject.com/my/functions</uri>   <function>   <name>getLastDataByType</name>   <function-class>com.myproject.app.util.TestFunction</function-class>   <function-signature>java.util.List getLastDataByType(int,int)</function-signature>  </function>  <function>   <name>isLogin</name>   <function-class>com.myproject.app.util.TestFunction</function-class>   <function-signature>boolean isLogin()</function-signature>  </function>  </taglib>

3.JSP引入;

  如:

  <%@ taglib uri="http://www.myproject.com/my/functions" prefix="my"%>

4.使用;

  如:${my:isLogin()};

  ${my:getLastDataByType(2,5)}